The relative proportion of the "state" in which mouse resources are maintained across all repositories (not a measure of unique strains).

The IMSR is a searchable online database of mouse strains, stocks, and
mutant ES cell lines available worldwide, including inbred, mutant,
and genetically engineered strains. The goal of the IMSR is to assist
the international scientific community in locating and obtaining mouse
resources for research. Note that the data content found in the IMSR is
as supplied by strain repository holders.

For each strain or cell line listed in the IMSR, users can obtain
information about:

Where that resource is available (Repository Site)

What state(s) the resource is available as (e.g. live, cryopreserved embryo or germplasm, ES cells)

View Repository Reports.
All regions and repositories are selected by default;
to limit your search to a specific region, click on
the map, or select one or more specific repositories
from the select list.